WO2019221259A1 - Structure for attaching metal diaphragm damper - Google Patents

Abstract

Provided is a structure for attaching a metal diaphragm damper that can exert a high pulsation reduction function with a simple structure. A structure for attaching a metal diaphragm damper 1, in which gas is encapsulated in an interior part S3 by a welding part W at which outer diameter sides of two disc-shaped diaphragms 2a, 2b are welded together in a ring shape, to a space 11 formed between a housing 16 and a housing cover 17, wherein the diaphragms 2a, 2b have outer peripheral parts 21, 21 on an outer diameter side of the welding part W, and the outer peripheral parts 21, 21 of the two diaphragms 2a and 2b are sandwiched in a plate thickness direction of the diaphragms 2a, 2b by the housing 16 and the housing cover 17.

Description

Metal diaphragm damper mounting structure

The present invention relates to a mounting structure of a metal diaphragm damper for absorbing pulsation used in a portion where pulsation occurs such as a high-pressure fuel pump.

There is a high-pressure fuel pump that pumps fuel supplied from the fuel tank to the injector. The high pressure fuel pump pressurizes and discharges fuel by reciprocating movement of a plunger driven by rotation of a camshaft of an internal combustion engine. In such a high pressure fuel pump, a pulsation is generated in the fuel chamber due to a change in the amount of fuel discharged from the high pressure fuel pump to the injector and a change in the injection amount of the injector. Generally, a damper is built in.

For example, in a metal diaphragm damper as disclosed in Patent Document 1, two disk-shaped diaphragms are welded at the outer diameter edge portion, so that a sealed space in which a gas of a predetermined pressure is sealed is formed. Formed in the fuel chamber. The fuel chamber is a space formed between the housing and the housing cover, and an annular mounting member is attached to the inner peripheral surface by friction engagement. The mounting member has clip-shaped holding portions at a plurality of locations in the circumferential direction, and the metal diaphragm damper is installed so as to partition the fuel chamber by sandwiching the outer diameter edge portion by the holding portions. Further, the fuel can flow into the space on both the front and back sides of the metal diaphragm damper in the fuel chamber through the radial gap between the mounting member and the metal diaphragm damper.

This metal diaphragm damper reduces the pulsation by changing the volume of the fuel chamber by elastically deforming each diaphragm in response to the fuel pressure accompanied by the pulsation. Also, for example, when a pulsation accompanied by a shock wave is received from one side of the metal diaphragm damper, the outer diameter edge of the diaphragm or the mounting member is deformed to reduce the pulsation while integrally moving both diaphragms to the other side. Can be done.

JP 2014-190188 A (7th page, FIG. 2)

Since the metal diaphragm damper of Patent Document 1 can perform elastic deformation of each diaphragm and integral movement of both diaphragms, high pulsation reduction capability can be realized, but a separate diaphragm is used to hold the metal diaphragm damper. Since the mounting member is used, the number of parts is large, the structure is complicated, and the assembling work is complicated. Further, since the clip-shaped holding portion is sandwiched from the outer diameter edge portion where the diaphragm is welded to the inner diameter side, it affects the deformation of the deformable portion on the inner diameter side with respect to the diaphragm welding position. It was.

This invention was made paying attention to such a problem, and it aims at providing the attachment structure of the metal diaphragm damper which can exhibit a high pulsation reduction function with a simple structure.

In order to solve the above-mentioned problem, the metal diaphragm damper mounting structure of the present invention is
Mounting structure for mounting a metal diaphragm damper, in which gas is sealed inside by a welded portion in which the outer diameter sides of two disk-shaped diaphragms are annularly welded, to a space formed between the housing and the housing cover Because
The diaphragm has an outer peripheral portion on the outer diameter side of the welded portion,
The outer peripheral portions of the two diaphragms are sandwiched in the thickness direction of the diaphragm by the housing and the housing cover.
According to this feature, the outer peripheral portions of the diaphragm are directly sandwiched between the housing and the housing cover, so that there is no need to prepare a separate mounting member and the like, and a pulsation accompanied by a shock wave is received from one side of the diaphragm. In this case, since the outer peripheral portion is deformed and a portion inside the welded portion of the diaphragm is allowed to move to the other side, a high pulsation reducing function can be realized with a simple structure.

Preferably, the outer peripheral portions of the two diaphragms are formed so as to be spaced apart from each other in the outer diameter direction.
According to this, since the elastic restoring force works when the outer peripheral portions are clamped by the housing and the housing cover, the metal diaphragm damper can be securely attached.

Preferably, a communication path communicating in the thickness direction is formed in the outer peripheral portion.
According to this, the communicating path which makes a fluid wrap around the diaphragm of both front and back can be formed simply.

Preferably, the communication path is formed by cutting out an outer edge of the outer peripheral portion.
According to this, even if it is a case where an outer peripheral part is small, a communicating path can be formed.

Preferably, a communication groove is formed between the housing and the housing cover.
According to this, a communication path having a wide channel cross-sectional area can be formed by the communication path on the diaphragm side and the communication groove on the housing side.

Preferably, on the inner diameter side of the welded portion of the two diaphragms, a curved portion that is curved away from each other toward the inner diameter side from the base end portion is formed. Is in contact.
According to this, it can suppress that stress is concentrated on the base end parts of a curved part, and stress is applied to a welding part.

Preferably, the outer peripheral portions of the two diaphragms are held apart from each other.
According to this, regardless of the dimensional accuracy of the housing and the housing cover, the metal diaphragm damper can be securely attached by the elastic restoring force of the outer peripheral portion.

Preferably, the outer peripheral portions of the two diaphragms are held in contact with each other.
According to this, outer peripheral parts can be integrally deformed.

It is sectional drawing which shows the high pressure fuel pump with which the metal diaphragm damper in Example 1 of this invention is incorporated. FIG. 3 is an exploded perspective view showing a structure around a metal diaphragm damper in the first embodiment. It is a bottom view which shows the state which attached the metal diaphragm damper in Example 1 between the housing and the housing cover. (A) is sectional drawing which shows the structure of the outer peripheral part of the metal diaphragm damper in Example 1, (b) is AA sectional drawing, (c) is BB sectional drawing. (A) is sectional drawing which shows the state at the time of diaphragm contraction in Example 1, (b) is sectional drawing which shows the state at the time of diaphragm movement in Example 1. FIG. (A) is sectional drawing which shows the state which attached the metal diaphragm damper in Example 2 of this invention between the housing and the housing cover, (b) is sectional drawing which shows the state at the time of the diaphragm movement in Example 2. FIG. . (A) is a top view which shows the metal diaphragm damper in Example 3 of this invention, (b) is sectional drawing which shows the state which attached the metal diaphragm damper in Example 3 between the housing and the housing cover.

DETAILED DESCRIPTION Embodiments for implementing a metal diaphragm damper according to the present invention will be described below based on examples.

The metal diaphragm damper mounting structure according to the first embodiment will be described with reference to FIGS.

As shown in FIG. 1, the metal diaphragm damper 1 of this embodiment is built in a high-pressure fuel pump 10 that pumps fuel supplied from a fuel tank through a fuel inlet (not shown) to the injector side. The high-pressure fuel pump 10 pressurizes and discharges fuel by reciprocating movement of a plunger 12 driven by rotation of a camshaft (not shown) of the internal combustion engine.

As a mechanism for pressurizing and discharging the fuel in the high-pressure fuel pump 10, first, when the plunger 12 descends, the suction valve 13 is opened and the fuel is sucked into the pressurizing chamber 14 from the fuel chamber 11 formed on the fuel inlet side. An inhalation stroke is performed. Next, when the plunger 12 is raised, a metering process is performed to return a part of the fuel in the pressurizing chamber 14 to the fuel chamber 11, and after closing the intake valve 13, the fuel is raised when the plunger 12 further rises. A pressurizing step for pressurizing is performed. Thus, the high-pressure fuel pump 10 pressurizes fuel by repeating the cycle of the intake stroke, the metering stroke, and the pressurization stroke, opens the discharge valve 15 and discharges the fuel to the injector side. At this time, a pulsation that repeats high pressure and low pressure occurs in the fuel chamber 11 due to a change in the amount of fuel discharged from the high pressure fuel pump 10 to the injector and a change in the injection amount of the injector.

The metal diaphragm damper 1 of the present embodiment is used for reducing pulsation generated in the fuel chamber 11 (space) of such a high-pressure fuel pump 10. The metal diaphragm damper 1 is disposed so as to divide the fuel chamber 11 of the high-pressure fuel pump 10 vertically. The fuel chamber 11 is composed of a recessed portion 16a that is recessed downward formed in the housing 16 of the high-pressure fuel pump 10 and a housing cover 17 that has a U-shaped section that faces downward and closes the recessed portion 16a. The metal diaphragm damper 1 is The outer peripheral portions 21 and 21 described later are sandwiched between the housing 16 and the housing cover 17.

As shown in FIG. 2 and FIG. 4, an annular wall 16b thinner than the housing body 16A is formed on the inner diameter side of the upper end edge of the housing 16 so as to extend upward. A step portion 16e is formed between the main body portion 16A. The step portion 16e includes an outer peripheral surface of the wall portion 16b, a horizontal surface 16f extending to the outer diameter side so as to be orthogonal to the wall portion 16b, and an outer peripheral surface of the housing main body portion 16A extending so as to be orthogonal to the outer edge of the horizontal surface 16f. It is configured. Further, convex portions 16c extending further upward are formed on the wall portion 16b at a predetermined interval in the circumferential direction. That is, a concave portion 16d formed by the side surface of the convex portion 16c and the upper end surface of the wall portion 16b is formed between the adjacent convex portions 16c. In FIG. 2, for convenience of explanation, illustration of the structure below the housing 16 is omitted.

The lower end portion of the housing cover 17 is formed with a cylindrical portion 17a that is externally fitted to the wall portion 16b. In the state where the cylindrical portion 17a is externally fitted to the wall portion 16b, the lower end surface is a horizontal surface of the step portion 16e. Positioned in the vertical direction in contact with 16f.

On the inner diameter side of the cylindrical portion 17a, the convex portion 16c is disposed so as to face the convex portion 16c with a distance L1 (see FIG. 4B) in the vertical direction in a state of being fitted to the wall portion 16b. An extending convex portion 17b and a concave portion 17c provided on the opposite side (upper side) of the concave portion 16d so as to face the concave portion 16d are formed. Thus, the convex part 16c and the convex part 17b are arrange | positioned with respect to the metal diaphragm damper 1 in the position on the opposite side to an up-down direction. The same applies to the concave portion 16d and the concave portion 17c.

That is, in a state where the housing cover 17 is attached to the housing 16, the distance L2 between the concave portion 16d and the concave portion 17c (see FIG. 4C) is greater than the distance L1 between the convex portion 16c and the convex portion 16c. And a gap S1 formed between the convex portion 16c and the convex portion 17b (see FIG. 4B) and a gap formed between the concave portion 16d and the concave portion 17c. S2 (refer to FIG. 4C) is provided inside the housing 16 and the housing cover 17 and is recessed on the outer diameter side in the circumferential direction. The housing 16 and the housing cover 17 are fixed in a sealed manner by laser welding.

As shown in FIGS. 1 and 2, the metal diaphragm damper 1 is configured in a disk shape by two disk-shaped diaphragms 2a and 2b being joined together in an air-tight manner by laser welding. Yes.

Specifically, the diaphragms 2a and 2b are formed with a welded portion W (particularly see FIG. 4A) inside the outer peripheral portions 21 and 21, and the outer edges of the outer peripheral portions 21 and 21 on the inner diameter side. A plurality of U-shaped cutouts 21a and 21a in a plan view that are recessed in the circumferential direction are formed in the circumferential direction (note that the cutouts 21a and 21a do not require cutout processing but are cutout shapes) Good.) That is, the outer peripheral portion 21 is formed with a plurality of mountain-shaped plate-like portions 21b in plan view (that is, remaining portions other than the notches 21a). The notches 21a and the plate-like portions 21b of the diaphragms 2a and 2b are welded and fixed with their positions in the circumferential direction being matched. In addition, the outer peripheral part 21 in a present Example points out the outer diameter side part rather than the welding part W in diaphragm 2a, 2b.

In a sealed space S3 formed between the joined diaphragms 2a and 2b (that is, an internal space of the metal diaphragm damper 1 (see FIGS. 1 and 4)), a gas having a predetermined pressure composed of argon, helium, or the like. Is enclosed. In addition, the metal diaphragm damper 1 can obtain suitable pulsation absorption performance by adjusting the volume change amount by the internal pressure of the gas sealed in the sealed space S3.

As shown in FIGS. 3 and 4A, the diaphragms 2a and 2b are formed by pressing a metal plate, and in order from the outer diameter side, the outer peripheral portion 21, the curved portion 22, and the central side (inner diameter side). The deformation acting portions 23 are respectively formed. The metal plates constituting the diaphragms 2a and 2b are laser-welded at the welded portion W by superimposing two metal plates of the same material and substantially the same shape, and the whole has a uniform thickness. In FIG. 3, the housing 16 actually exists on the front side of the sheet, but the illustration of the configuration of the housing 16 is omitted for convenience of explanation.

In particular, as shown in FIG. 4A, the plate- like portions 21b and 21b, which are the outer peripheral portions 21 and 21 of the diaphragms 2a and 2b, are separated from each other as they go in the outer diameter direction (in FIG. The same shall apply hereinafter.) Further, the curved portions 22 and 22 of the diaphragms 2a and 2b are curved in an S-shaped cross section from the welded portion W toward the inner diameter side, and the first curved portions 22a and 22a that are base end portions on the welded portion W side. Are curved so that their tops approach each other, and the second bending parts 22b, 22b on the deformation acting part 23 side are curved in directions away from each other. The first curved portions 22a and 22a are in contact with each other when no pulsation is applied to the diaphragms 2a and 2b (that is, when the fuel chamber 11 is at a low pressure).

The deformation acting part 23 is a dome-shaped part that is elastically deformed by the differential pressure between the external pressure and the internal pressure of the gas sealed in the sealed space S3. In addition, the deformation | transformation action part 23 is good also as a shape which has a single continuous curved surface, and a shape which has several curved surfaces, for example, a cross-sectional view waveplate shape, It can change freely.

As shown in FIGS. 3 and 4B, in the metal diaphragm damper 1, the plate-like portions 21b of the diaphragms 2a and 2b are located between the convex portion 16c of the housing 16 and the convex portion 17b of the housing cover 17. It is held in the thickness direction by (gap S1).

Specifically, in the state before the plate- like portions 21b and 21b, which are the outer peripheral portions 21 and 21, are sandwiched between the convex portion 16c and the convex portion 17b (see FIG. 4A). The outer edges of the outer peripheral portions 21 and 21 are separated from each other in the plate thickness direction by a distance L10. In the state where the plate- like portions 21b and 21b, which are the outer peripheral portions 21 and 21, are sandwiched between the convex portion 16c and the convex portion 17b (see FIG. 4B), the outer peripheral portion 21. , 21 are parallel to each other with a distance L1 that is shorter than the distance L10 and spaced apart in the plate thickness direction (L1 <L10). That is, when the outer peripheral parts 21 and 21 are sandwiched between the convex part 16c and the convex part 17b, the elastic restoring force of the outer peripheral parts 21 and 21 acts on the convex part 16c and the convex part 17b. Therefore, regardless of the dimensional accuracy of the housing 16 and the housing cover 17, the metal diaphragm damper 1 can be securely attached without rattling. Further, since the outer diameter of the metal diaphragm damper 1 is smaller than the inner diameter of the cylindrical portion 17a, a gap is formed in the radial direction between the metal diaphragm damper 1 and the cylindrical portion 17a.

As shown in FIGS. 3 and 4 (c), the notches 21a of the diaphragms 2a and 2b are partially fueled in a state where the metal diaphragm damper 1 is mounted between the housing 16 and the housing cover 17. It is disposed in the chamber 11. Therefore, the fuel in the fuel chamber 11 can be moved to one side (lower side) and the other side (upper side) of the metal diaphragm damper 1 through the notches 21a.

Further, each notch 21a communicates with a gap S2 (communication groove) between the concave portion 16d and the concave portion 17c, and the gap S2 is larger in the vertical direction than the gap S1. That is, each notch 21a and the gap S2 function as a communication path communicating with one side and the other side of the metal diaphragm damper 1, and the flow passage cross-sectional area of the communication path can be widened. Further, since the gaps S1 and S2 are continuous in the circumferential direction, the flow passage cross-sectional area of the communication path can be formed wider than in the case where the gaps are divided in the circumferential direction. Moreover, since the notch 21a is formed by notching the outer edges of the outer peripheral portions 21, 21, a communication path can be formed even when the outer peripheral portions 21, 21 have a narrow radial width.

Next, the operation will be described. As shown in FIG. 5A, when the fuel pressure associated with the pulsation changes from a low pressure to a high pressure and the diaphragms 2a and 2b receive the fuel pressure almost uniformly from the fuel chamber 11 side, the deformation acting portions 23 and 23 are sealed. The space S3 is deformed so as to be crushed. In addition, when the deformation | transformation action parts 23 and 23 are crushed by the sealed space S3 side, the gas in sealed space S3 is compressed.

When the deformation acting portions 23 and 23 are crushed toward the sealed space S3, the diaphragms 2a and 2b expand in the outer diameter direction. As described above, since a gap is formed in the radial direction between the metal diaphragm damper 1 and the cylindrical portion 17a, the diameter of the diaphragms 2a and 2b is allowed to be increased, and the inner diameter side of the welded portion W is allowed. The provided curved portions 22 and 22 are deformed. In particular, since the curved portions 22 and 22 are deformed in a direction approaching each other, the first curved portions 22a and 22a are further strongly pressed to concentrate stress on the first curved portions 22a and 22a. Thereby, it is difficult to apply a large stress to the welded portion W, and damage to the welded portion W is prevented.

Thus, since the outer peripheral portions 21 and 21 on the outer diameter side of the welded portion W are sandwiched between the housing 16 and the housing cover 17, the deformation acting portions 23 disposed on the inner diameter side of the welded portion W, 23, the housing 16 and the housing cover 17 do not come into contact with each other, and the housing 16 and the housing cover 17 do not hinder the elastic deformation of the deformation acting portions 23, 23. That is, the housing 16 and the housing cover 17 can be prevented from affecting the pulsation reducing function.

Further, since the outer peripheral portions 21 and 21 of the diaphragms 2a and 2b are directly sandwiched by the housing 16 and the housing cover 17, it is not necessary to prepare separate mounting members and the like, and the number of parts can be reduced. That is, in the mounting structure of the metal diaphragm damper 1 of the present embodiment, a high pulsation reducing function can be realized with a simple structure. In addition, since the high-strength housing 16 and the housing cover 17 sandwich the outer peripheral portions 21 and 21, the metal diaphragm damper 1 is securely held as compared with the case where the metal diaphragm damper 1 is held by a separate mounting member. it can.

Further, as shown in FIG. 5 (b), when a large pulsation accompanied by a shock wave is received from one side (lower side) of the metal diaphragm damper 1, the diaphragm damper 1 is entirely placed on the other side (upper side) immediately thereafter. ), The force generated by the shock wave can be reduced.

Specifically, when the inner portion of the diaphragms 2a and 2b than the welded portion W receives a force in the upper direction of the metal diaphragm damper 1 as a whole, the outer peripheral portion 21 of the diaphragm 2a and the outer peripheral portion of the diaphragm 2b almost simultaneously. 21 rotate with respect to the elastic deformation and the gap S1. The curved portion 22 and the deformation acting portion 23 in the diaphragm 2a are slightly curved upward because the fuel is present on the upper side, while the curved portion 22 and the deforming acting portion 23 in the diaphragm 2b are further pushed upward. And it deform | transforms so that it may be crushed by the sealed space S3 side (refer FIG.5 (b)). Thereafter, when a high pressure is propagated to the diaphragm 2a side, the diaphragm 2a is also crushed to the sealed space S3 side, and the diaphragm damper 1 is deformed (see FIG. 5A).

As described above, since the welded portion W is provided on the inner side of the outer peripheral portions 21 and 21 which are the fixed portions of the metal diaphragm damper 1, the outer peripheral portions 21 and 21 are deformed to be on the inner side of the welded portion W in the diaphragms 2a and 2b. Thus, a large pulsation accompanied by a shock wave can be reduced.

Further, when the metal diaphragm damper 1 is moved from one side to the other side due to a large pulsation accompanied by a shock wave, the outer peripheral portion 21 of the diaphragm 2a and the outer peripheral portion 21 of the diaphragm 2b are separately elastically deformed and rotated, and the diaphragm Since the outer peripheral portion 21 of 2a and the outer peripheral portion 21 of the diaphragm 2b are deformed differently, stress can be distributed to different portions of the outer peripheral portions 21 and 21, and the outer peripheral portions 21 and 21 can be prevented from being damaged.

In addition, depending on the type of the high-pressure fuel pump 10 to which the metal diaphragm damper 1 is applied, a portion inside the welded portion W in the diaphragms 2a and 2b may move from the upper side to the lower side.

Next, the metal diaphragm damper mounting structure according to the second embodiment will be described with reference to FIG. Note that the same components as those shown in the above embodiment are given the same reference numerals and redundant description is omitted.

As shown in FIG. 6A, the convex portion 16c ′ of the housing 16 and the convex portion 17b ′ of the housing cover 17 according to the second embodiment are arranged closer to those of the first embodiment. The metal diaphragm damper 1 includes a state in which the outer peripheral portions 21 and 21 are in contact with each other in the plate thickness direction in a state where the outer peripheral portions 21 and 21 are sandwiched between the convex portions 16c ′ and 17b ′. It has become.

As shown in FIG. 6 (b), when the portion inside the welded portion W in the diaphragms 2a and 2b receives a large pulsation from one side to the other side, the convex portion 16c ′ in the outer peripheral portions 21 and 21 It deforms from the edge on the inner diameter side with the convex portion 17b ′. That is, the outer peripheral portions 21 and 21 can be integrally deformed, and the elastic return force of the outer peripheral portions 21 and 21 is not applied when the outer peripheral portions 21 and 21 are deformed. It is easier to move the inner part than.

In addition, the edge portions on the inner diameter side of the convex portions 16c ′ and the convex portions 17b ′ in the outer peripheral portions 21 and 21 may be formed thinly to be easily deformed, or the edge portions may be formed thick to form the edges. You may make it raise the intensity | strength of a part.

Next, a metal diaphragm damper mounting structure according to the third embodiment will be described with reference to FIG. Note that the same components as those shown in the embodiment are given the same reference numerals and redundant description is omitted.

As shown in FIG. 7A, in the metal diaphragm damper 100 of the third embodiment, through holes 211b having a circular shape in plan view that penetrate the outer peripheral portions 211 of the diaphragms 102a and 102b in the plate thickness direction are provided in the circumferential direction. A plurality are formed apart from each other. As shown in FIG. 7B, each through hole 211b is disposed in the fuel chamber 11 in a state where the metal diaphragm damper 100 is mounted between the housing 16 and the housing cover 17, and each through hole 211b The fuel can be moved to one side and the other side of the metal diaphragm damper 100 through the hole 211b. The through hole 211b is not limited to a circular shape in plan view, and may be, for example, an elliptical shape (long hole) or a rectangular shape in plan view.

Although the embodiments of the present invention have been described with reference to the drawings, the specific configuration is not limited to these embodiments, and modifications and additions within the scope of the present invention are included in the present invention. It is.

For example, in the first to third embodiments, the diaphragms 2a and 2b are described as being joined by laser welding. However, the present invention is not limited to this, and the sealed space S3 can be formed between the diaphragms 2a and 2b. For example, they may be joined by various welding or caulking.

In the first to third embodiments, the metal diaphragm damper side communication path (notch 21a or through hole 211b) and the housing and housing cover side communication paths (gap S1, S2) are exemplified. However, the communication path may be provided on at least one side of the metal diaphragm damper side or the housing and housing cover side.

In the first to third embodiments, the first curved portions 22a and 22a are in contact with each other in the circumferential direction. However, the present invention is not limited to this, and projections are provided in the circumferential direction on the base end portion (that is, the welded portion W side). A plurality of protrusions may be provided so that the protrusions are in contact with each other.

Further, a regulating member that regulates excessive elastic deformation of the diaphragms 2a and 2b (particularly the curved portion 22) may be disposed inside the metal diaphragm damper 1. In this case, it is preferable that the regulating member has a shape that does not hinder an appropriate volume change rate of the diaphragms 2a and 2b. Further, it is preferable that the regulating member is made of a material that does not damage the diaphragms 2a and 2b due to contact with the regulating member when the diaphragms 2a and 2b are elastically deformed.

Moreover, in the said Example, although the diaphragm 2a, 2b which has the curved part 22 of S-shaped cross section and the dome-shaped deformation | transformation action part 23 was demonstrated, the shape of a diaphragm may be designed freely, for example, The shape may include a deforming portion having a linear cross section and a curved portion having a circular arc shape provided at the outer edge thereof.

DESCRIPTION OF SYMBOLS 1 Metal diaphragm damper 2a, 2b Diaphragm 10 High pressure fuel pump 11 Fuel chamber (space)
16 Housing 16c, 16c 'Convex part 16d Concave part 17 Housing cover 17b, 17b' Convex part 17c Concave part 21 Outer part 21a Notch (communication path)
22 bending portion 22a first bending portion (contact portion)
22b 2nd bending part 23 deformation | transformation action part S1, S2 clearance gap (communication path, communication groove)
S3 Sealed space W Welded part

Claims (8)

1. Mounting structure for mounting a metal diaphragm damper, in which gas is sealed inside by a welded portion in which the outer diameter sides of two disk-shaped diaphragms are annularly welded, to a space formed between the housing and the housing cover Because
   The diaphragm has an outer peripheral portion on the outer diameter side of the welded portion,
   The metal diaphragm damper mounting structure, wherein the outer peripheral portions of the two diaphragms are sandwiched by the housing and the housing cover in the thickness direction of the diaphragm.
2. 2. The metal diaphragm damper mounting structure according to claim 1, wherein the outer peripheral portions of the two diaphragms are formed so as to be spaced apart from each other in the outer diameter direction.
3. The metal diaphragm damper mounting structure according to claim 1 or 2, wherein a communication path communicating in the plate thickness direction is formed in the outer peripheral portion.
4. The metal diaphragm damper mounting structure according to claim 3, wherein the communication path is formed by cutting out an outer edge of the outer peripheral portion.
5. The metal diaphragm damper mounting structure according to claim 3 or 4, wherein a communication groove is formed between the housing and the housing cover.
6. On the inner diameter side of the welded portions of the two diaphragms, there are formed curved portions that are curved away from each base end portion toward the inner diameter side, and these base end portions are in contact with each other. The metal diaphragm damper mounting structure according to any one of claims 1 to 5.
7. The metal diaphragm damper mounting structure according to any one of claims 1 to 6, wherein the outer peripheral portions of the two diaphragms are held apart from each other.
8. The metal diaphragm damper mounting structure according to any one of claims 1 to 6, wherein the outer peripheral portions of the two diaphragms are held in contact with each other.

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